[PATCH 3.18 098/120] dm thin metadata: fix __udivdi3 undefined on 32-bit

Greg Kroah-Hartman
2018-10-11T15:40:13Z

From: Mike Snitzer <snitzer@redhat.com>

commit 013ad043906b2befd4a9bfb06219ed9fedd92716 upstream.

sector_div() is only viable for use with sector_t.
dm_block_t is typedef'd to uint64_t -- so use div_u64() instead.

Fixes: 3ab918281 ("dm thin metadata: try to avoid ever aborting transactions")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/dm-thin-metadata.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -840,10 +840,8 @@ static void __set_metadata_reserve(struc
if (r) {
DMERR("could not get size of metadata device");
pmd->metadata_reserve = max_blocks;
- } else {
- sector_div(total, 10);
- pmd->metadata_reserve = min(max_blocks, total);
- }
+ } else
+ pmd->metadata_reserve = min(max_blocks, div_u64(total, 10));
}

struct dm_pool_metadata *dm_pool_metadata_open(struct block_device *bdev,